Source One of the most common questions asked by people who dye their hair is whether you can bleach damaged hair. The answer to this question isn't a simple yes or no. There are many factors that should be taken into account in regards to damaged hair and you will need to assess it on a case by case basis. What is damaged hair? Damaged hair is hair that has become weakened through chemical or physical stress. This can include hair that has been dyed, bleached, permed, relaxed, or even styled with heated styling tools. All of these processes damage your hair to some extent and weaken it over time. Hair that is damaged is significantly more prone to breakage, doesn't feel as soft or smooth, and may even look visibly damaged. On top of this, damaged hair doesn't maintain moisture properly, so it is prone to both dryness and frizz. This dryness itself can even cause further damage if the hair is handled in its dry state. The main effects of damage include: Dryness